diff --git a/docsrc/imap/developer/developer-testing.rst b/docsrc/imap/developer/developer-testing.rst
index 90062c02416..2775c525e11 100644
--- a/docsrc/imap/developer/developer-testing.rst
+++ b/docsrc/imap/developer/developer-testing.rst
@@ -45,6 +45,7 @@ Install and configure Cassandane
 
    .. code-block:: bash
 
+        sudo cpan -i AnyEvent Config::IniFiles File::Slurp Net::Server::PreForkSimple
         sudo cpan -i Tie::DataUUID
         sudo cpan -i XML::Spice
         sudo cpan -i XML::Fast